4.5 Article

Adaptive response in mice exposed to 900 MHZ radiofrequency fields: Bleomycin-induced DNA and oxidative damage/repair

Journal

INTERNATIONAL JOURNAL OF RADIATION BIOLOGY
Volume 91, Issue 3, Pages 270-276

Publisher

TAYLOR & FRANCIS LTD
DOI: 10.3109/09553002.2014.980465

Keywords

Radiofrequency fields; adaptive response; bleomycin; mice; DNA damage/repair; oxidative damage/repair

Funding

  1. National Natural Science Foundation of China [81373025, 81302463]
  2. 973 project grant from China Ministry of Science and Technology [2011CB503705]
  3. Priority Academic Program Development of Jiangsu Higher Education Institutions

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Purpose: To determine whether mice exposed to radio-frequency fields (RF) and then injected with a radiomimetic drug, bleomycin (BLM), exhibit adaptive response and provide some mechanistic evidence for such response. Materials and methods: Adult mice were exposed to 900 MHz RF at 120 mW/cm(2) power density for 4 hours/day for 7 days. Immediately after the last exposure, some mice were sacrificed while the others were injected with BLM 4 h later. In each animal: (i) The primary DNA damage and BLM-induced damage as well as its repair kinetics were determined in blood leukocytes; and (ii) the oxidative damage was determined from malondialdehyde (MDA) levels and the antioxidant status was assessed from superoxide dismutase (SOD) levels in plasma, liver and lung tissues. Results: There were no indications for increased DNA and oxidative damages in mice exposed to RF alone in contrast to those treated with BLM alone. Mice exposed to RF. BLM showed significantly: (a) reduced BLM-induced DNA damage and that remained after each 30, 60, 90, 120 and 150 min repair time, and (b) decreased levels of MDA in plasma and liver, and increased SOD level in the lung. Conclusions: The overall data suggested that RF exposure was capable of inducing adaptive response and mitigated BLM-induced DNA and oxidative damages by activating certain cellular processes.

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